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Superior plasmon absorption in iron-doped gold nanoparticles
Vincenzo Amendola1, Rosalba Saija, Onofrio M Maragò
1Department of Chemical Sciences, University of Padova, via Marzolo 1, I-35131 Padova, Italy. vincenzo.amendola@unipd.it.
Nanoscale
|April 24, 2015
Summary
Iron doping in gold nanoparticles significantly boosts light absorption for heat conversion. This gold-iron nanoalloy shows enhanced performance, especially in nanoshells, for practical plasmonic applications.
Area of Science:
- Nanotechnology
- Materials Science
- Plasmonics
Background:
- Localized surface plasmons enhance light scattering and absorption.
- Efficient light-to-heat conversion relies on light absorption by nanoparticles.
Purpose of the Study:
- To investigate the effect of iron doping on the optical properties of gold nanoparticles.
- To enhance the light absorption capabilities of gold nanoparticles for photothermal applications.
Main Methods:
- Fabrication of gold-iron nanoalloys with iron as a substitutional dopant.
- Characterization of optical properties, focusing on absorption cross-section.
- Evaluation of size and shape dependency, particularly in nanoshell structures.
Main Results:
- Iron doping in gold nanoparticles (gold-iron nanoalloys) significantly increases the absorption cross-section.
- The enhancement in absorption is dependent on nanoparticle size and shape.
- Nanoshell structures exhibited a 90-190% improvement in absorption within a critical size range.
Conclusions:
- Gold-iron nanoalloys offer a promising route to enhance light-to-heat conversion efficiency.
- The findings challenge previous assumptions about the plasmonic response of noble metal alloys.
- This work opens new avenues for designing efficient plasmonic materials for photothermal applications.
